Door curtain with freely adjustable height

Abstract

The utility model discloses a door curtain with freely adjustable height, which comprises a curtain body and a pull rope, the pull rope penetrates along the length direction of the curtain body, one end of the pull rope extends out of the bottom of the curtain body, the other end of the pull rope is fixed at the top of the curtain body, and the end of the pull rope extending out of the bottom of the curtain body is connected with a height adjusting piece. The end of the pull rope is connected with a winder, the winder comprises a shell with a rotating shaft and a rotating core arranged on the rotating shaft in a sleeving mode, a coil spring is arranged in the rotating core, and the two ends of the coil spring are connected with the rotating shaft and the rotating core respectively. The end part of the pull rope is connected with the rotating core through the opening of the shell and is wound by the rotating core, and the height adjusting piece is limited outside the opening of the winder; the height of the door curtain can be conveniently and randomly adjusted without knotting the pull rope or untying the rope knot all the time.

Description

Technical Field

[0001] The present application relates to the field of door curtains, and in particular to a door curtain with high degree of freedom of adjustment. Background Art

[0002] Door curtains are mainly hung at the door. They can facilitate entry and exit while blocking the line of sight and improving privacy.

[0003] When people frequently go in and out, the existence of the door curtain is not very convenient, so the door curtain will be folded. An existing door curtain is provided with a drawstring, and the drawstring is passed through the front and back sides of the door curtain from top to bottom. When it is necessary to fold it, one hand grasps the bottom of the drawstring, and then the other hand holds the drawstring in the air and pushes the bottom of the door curtain upward. The door curtain is folded upward. Thus, the door curtain is folded. After the door curtain is folded, the hanging drawstring needs to be knotted. On the one hand, the extra line segment of the drawstring can be shortened, and on the other hand, the bottom of the door curtain will not pass through the knot, so that the door curtain remains folded.

[0004] Since the height of the door curtain can only be fixed after the knot is folded, when the door curtain needs to be adjusted to a different height, it is still necessary to untie the knotted drawstring, adjust and determine the height of the door curtain, and then tie the drawstring again to fix the height of the door curtain. This method is troublesome to operate, and the knot position is not easy to control when tying the drawstring. Summary of the invention

[0005] The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, to be able to freely adjust the folding height of the door curtain very conveniently, and to provide a door curtain with freely adjustable height.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] A door curtain with freely adjustable height comprises a curtain body and a pull cord, wherein the pull cord is passed through the length direction of the curtain body and one end of the pull cord extends out of the bottom of the curtain body, and the other end of the pull cord is fixed to the top of the curtain body, and the end of the pull cord extending out of the bottom of the curtain body is connected to a height adjustment member, and the end of the pull cord is connected to a winder, and the winder comprises a shell with a rotating shaft and a rotating core sleeved on the rotating shaft, and the rotating core has a coil spring built therein, and the two ends of the coil spring are respectively connected to the rotating shaft and the rotating core; the end of the pull cord is connected to the rotating core through an opening of the shell and is wound up by the rotating core, and the height adjustment member is restricted outside the opening of the winder.

[0008] Preferably, the height adjustment member includes a first clamping portion, a second clamping portion movable relative to the first clamping portion, and a clamping elastic member arranged therebetween; the pull rope is respectively passed through the first clamping portion and the second clamping portion; the first clamping portion and the second clamping portion clamp the pull rope through the tension of the clamping elastic member.

[0009] Preferably, the rotating core includes a shaft sleeve, a hook fixedly arranged on the shaft sleeve, and a one-way rotating limiting component rotatably arranged on the shaft sleeve; the hook is connected to the pulling rope, and the active end of the one-way rotating limiting component is located at the hook; the housing is limitedly connected to a ratchet wheel; the passive end of the one-way rotating limiting component can be located inside or outside the ratchet tooth groove of the ratchet wheel.

[0010] Preferably, the ratchet tooth groove has a rotation stopping surface and a pushing surface; the passive end can be restricted by the rotation stopping surface when moving towards the pushing surface direction; the passive end can be pushed by the pushing surface when moving towards the pushing surface direction.

[0011] Preferably, the one-way rotating limiting component includes a limiting elastic member and a limiting disc rotatably connected to the shaft sleeve. The limiting disc has an active protrusion, and the active end of the one-way rotating limiting component is the active protrusion. The hook is provided with a relief groove, and the active protrusion is located in the relief groove, and one side of the active protrusion extends out of the relief groove; both ends of the limiting elastic member are respectively connected to the limiting disc and the shaft sleeve; the limiting disc has a passive protrusion, and the passive protrusion is the passive end of the one-way rotating limiting component; the limiting disc also has a rotating protrusion for rotating around the shaft sleeve.

[0012] Preferably, the shaft sleeve is provided with a first chamber and a second chamber. The coil spring is located in the first chamber, and both the one-way rotating limiting component and the ratchet wheel are located in the second chamber.

[0013] Preferably, the housing includes an upper shell and a lower shell. The rotating core is located between the upper shell and the lower shell. The upper shell is fixed with a rotating shaft, and one end of the rotating shaft passes through the rotating core and is connected to the lower shell.

[0014] Preferably, the rotating core is fixedly provided with a fixing plate. One end of the coil spring is connected to the rotating shaft, and the other end is connected to the rotating shaft.

[0015] Preferably, a plurality of pull rings are arranged along the length direction of the curtain body, and the pulling rope sequentially passes through the plurality of pull rings.

[0016] Preferably, a fixing strip is sewn along the length direction of the curtain body, and each pull ring is sewn to the fixing strip through a thin rope.

[0017] In summary, the utility model includes the following beneficial technical effects:

[0018] The height of the curtain can be conveniently and arbitrarily adjusted without constantly tying or untying knots on the pulling rope. The redundant part of the pulling rope can be gathered and wound, so that the redundant pulling rope will not hang below the curtain, thus solving the problems of the curtain being unbeautiful, and the redundant pulling rope being entangled and tripping. Description of the Drawings

[0019] Figure 1 It is a schematic three-dimensional structure diagram of the front side of the curtain.

[0020] Figure 2 It is a schematic three-dimensional structure diagram of the back side of the curtain.

[0021] Figure 3 It is a schematic front-side structure diagram when the curtain is retracted.

[0022] Figure 4 It is a schematic back-side structure diagram when the curtain is retracted.

[0023] Figure 5 It is Figure 2 an enlarged structure diagram of the position A in

[0024] Figure 6 It is an exploded structure diagram of the winding device in the back direction.

[0025] Figure 7 It is an exploded structure diagram of the winding device in the front direction.

[0026] Figure 8 It is a structural diagram of the one-way rotation limiting assembly when the passive protrusion is located in the ratchet tooth groove.

[0027] Figure 9 It is a structural diagram of the one-way rotation limiting assembly when the passive protrusion leaves the ratchet tooth groove.

[0028] Figure 10 It is a schematic three-dimensional structure diagram of the one-way rotation limiting assembly.

[0029] Figure 11 It is a schematic three-dimensional structure diagram of the one-way rotation limiting assembly with a ratchet.

[0030] Explanation of reference numerals: 1. curtain body; 11. drawstring; 12. pull ring; 13. fixing strip; 2. height adjuster; 21. first clamping part; 22. second clamping part; 23. clamping elastic part; 3. winding device; 31. housing; 311. opening; 312. upper shell; 313. lower shell; 314. rotating shaft; 315. fixing plate; 316. ratchet; 3161. ratchet tooth groove; 3162. anti-rotation surface; 3163. pushing surface; 3164. convex part; 3165. concave part; 32. rotating core; 321. isolation sheet; 3211. first mounting protrusion; 3212. first mounting groove; 322. bushing; 3221. first chamber; 3222. second chamber; 3223. hook; 3224. relief groove; 323. isolation sleeve; 3231. through port; 3232. second mounting groove; 3233. second mounting protrusion; 33. torsion spring; 34. one-way rotation limiting assembly; 35. limiting disc; 351. active protrusion; 352. passive protrusion; 353. rotating protrusion; 36. limiting elastic part. Detailed implementation mode

[0031] In this specification, the orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc., which are mentioned or may be mentioned, are defined relative to the structures shown in the respective drawings. They are relative concepts, and therefore may change accordingly depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for descriptive and distinguishing purposes, and should not be understood as indicating or implying the relative importance of the corresponding components.

[0032] The following further elaborates on this application in conjunction with the Figure 1 - attached Figure 11 drawings.

[0033] An embodiment of this application discloses a curtain with highly adjustable height.

[0034] Referring to Figures 1 - 5 , a curtain with highly adjustable height includes a curtain body 1 and a drawstring 11. The curtain body 1 is provided with a fixing strip 13 and a plurality of pull rings 12 along the length direction. The fixing strip 13 is connected from the top to the bottom of the curtain body 1 by sewing. Each pull ring 12 is connected to the fixing strip 13 by a thin string, and the drawstring 11 passes through a plurality of pull rings 12 in sequence. The curtain body 1 has an upper part and a lower part. A magic tape is sewn at the upper end of the curtain body 1. When sewing the magic tape, the upper end of the drawstring 11 is fixed between the magic tape and the curtain body 1. The side of the curtain with the magic tape is the back side of the curtain.

[0035] The upper end of the drawstring 11 is fixed to the upper part of the curtain body 1, and the lower part of the drawstring 11 extends out of the lower part of the curtain body 1. One end of the drawstring 11 extending out of the lower part of the curtain body 1 is connected with a height adjusting member 2. The height adjusting member 2 can be clamped at any position of the drawstring 11.

[0036] Referring to Figure 5The height adjustment member 2 includes a first clamping portion 21 and a second clamping portion 22. The first clamping portion 21 is sleeved on the second clamping portion 22, and the first clamping portion 21 and the second clamping portion 22 can slide relative to each other. The pull rope 11 passes through the first clamping portion 21 and the second clamping portion 22 respectively. A clamping elastic member 23 is connected between the first clamping portion 21 and the second clamping portion 22. The clamping elastic member 23 is a spring. Under the action of the clamping elastic member 23, the holes on the first clamping portion 21 and the holes on the second clamping portion 22 are mutually displaced and squeeze the pull rope, so that the pull rope 11 can be clamped, so that the height adjustment member 2 can be clamped on the pull rope 11. When it is necessary to adjust the height adjustment member 2, the first clamping portion 21 and the second clamping portion 22 are pressed so that the first clamping portion 21 and the second clamping portion 22 no longer clamp the pull rope 11, and the height adjustment member 2 is moved along the pull rope 11. When the height adjustment member 2 moves upward, the height adjustment member 2 will press against the bottom of the curtain body 1 to close the curtain body 1. After the first clamping portion 21 and the second clamping portion 22 are released, the clamping elastic member 23 continues to clamp the first clamping portion 21 and the second clamping portion 22 to the pull rope 11, so that the curtain body 1 will not fall down and the curtain body 1 is always in a closed state.

[0037] By providing the height adjusting member 2 , the curtain body 1 can be folded at any position without tying a knot on the pull rope 11 .

[0038] The winder 3 is connected to the lower end of the pull cord 11. The winder 3 can wind up the excess pull cord 11.

[0039] Reference Figures 5 - 7 The winder 3 includes a shell 31 and a rotating core 32. The shell 31 includes an upper shell 312 and a lower shell 313. The rotating core 32 is located between the upper shell 312 and the lower shell 313. The upper shell 312 is fixed with a rotating shaft 314. One end of the rotating shaft 314 passes through the rotating core 32 and is connected to the lower shell 313. The rotating core 32 has a built-in coil spring 33. Under the action of the coil spring 33, the rotating core 32 can rotate relative to the rotating shaft 314.

[0040] The housing 31 has an opening 311. The end of the pull rope 11 enters the opening 311 and is connected to the rotating core 32. The height adjustment member 2 is restricted outside the opening 311 of the winder 3. When the winder 3 winds the pull rope 11, the height adjustment member 2 will not be wound into the opening 311.

[0041] The rotating core 32 includes a shaft sleeve 322 , a hook 3223 and a one-way rotation component. The hook 3223 is fixedly arranged on the outer side of the shaft sleeve 322 ; the one-way rotation limiting component 34 can rotate relative to the shaft sleeve 322 .

[0042] The bushing 322 is provided with a first chamber 3221. A fixing plate 315 is arranged at the first chamber 3221. The coil spring 33 is located within the first chamber 3221. One end of the coil spring 33 is connected to the fixing plate 315, and the other end of the coil spring 33 is connected to the rotating shaft 314.

[0043] The bushing 322 includes a separator 321. The separator 321 is installed at the outlet of the first chamber 3221. The separator 321 has a first mounting protrusion 3211, and a first mounting groove 3212 adapted to the first mounting protrusion 3211 is provided on the side wall of the first chamber 3221.

[0044] In this application, there are multiple first mounting protrusions 3211 and first mounting grooves 3212. The function of the separator 321 is to prevent the torsion spring from directly contacting the housing 31.

[0045] The bushing 322 is provided with a second chamber 3222, and the orientation of the second chamber 3222 is opposite to that of the first chamber 3221. In this application, the opening 311 of the first chamber 3221 faces the upper housing 312, and the opening 311 of the second chamber 3222 faces the lower housing 313. The one-way rotation limiting assembly 34 is located within the second chamber 3222. The one-way rotation assembly has an active end and a passive end. The lower housing 313 is limitedly connected with a ratchet wheel 316. The ratchet wheel 316 is limitedly connected through its convex part 3164 and the concave part 3165 of the lower housing, thereby restricting the circumferential rotation of the ratchet wheel 316 relative to the rotating shaft 314. The ratchet wheel 316 is also located within the second chamber 3222, and the passive end of the one-way rotation limiting assembly 34 is located within the ratchet teeth of the ratchet wheel 316. The ratchet wheel 316 is relatively stationary with respect to the housing 31.

[0046] The active end of the one-way rotation limiting assembly 34 is located at the hook 3223; the lower housing 313 is installed with a ratchet wheel 316, and the ratchet wheel 316 is relatively stationary with respect to the housing 31; the passive end of the one-way rotation limiting assembly 34 is located within the ratchet tooth groove 3161 of the ratchet wheel 316.

[0047] Refer to Figures 8 - 11 As shown in, the one-way rotation limiting assembly 34 includes a limiting elastic member 36 and a limiting disc 35. The limiting disc 35 has a rotating protrusion 353 and is rotationally connected to the bushing 322 through the rotating protrusion 353, enabling the limiting disc 35 to rotate relative to the bushing 322. The limiting elastic member 36 is a spring. One end of the limiting elastic member 36 is connected to the limiting disc 35, and the other end is connected to the side wall of the second chamber 3222.

[0048] Refer to Figures 8 - 11, the limiting disk 35 has an active protrusion 351 and a passive protrusion 352. The passive protrusion 352 is the passive end of the one-way rotation limiting component 34, and the active protrusion 351 is the active end of the one-way rotation limiting component 34. The hook 3223 is provided with a relief groove 3224 communicating with the second chamber 3222, and the active protrusion 351 extends into the relief groove 3224. One side of the active protrusion 351 extends out to the relief groove 3224, so that part of the active protrusion 351 is exposed on the surface of the hook 3223. After the pull cord 11 is hung on the hook 3223, when the pull cord 11 pulls the hook 3223, the pull cord 11 will push the active protrusion 351, causing the limiting disk 35 to rotate with the rotating protrusion 353 as the origin. When the pull cord 11 is removed from the hook 3223 or the pull cord 11 does not apply force to the hook 3223, the limiting elastic member 36 will reset the limiting disk 35, making the active protrusion 351 continue to be exposed on the surface of the hook 3223.

[0049] Referring to Figures 8 - 11 , when the active protrusion 351 is exposed from the surface of the hook 3223, the passive protrusion 352 will be in the ratchet tooth groove 3161. The ratchet tooth groove 3161 has a rotation stopping surface 3162 and a pushing surface 3163. When the rotating core 32 rotates, the limiting disk 35 will rotate relative to the ratchet wheel 316. When the torsion spring 33 drives the rotating core 32 so that the hook 3223 on the rotating core 32 can wind up the pull cord 11, the rotation direction of the rotating core 32 is defined as clockwise. Then the rotation direction of the rotating core 32 when the rotating core 32 pays out the pull cord 11 is counterclockwise.

[0050] The rotation stopping surface 3162 is located on the moving path of the passive protrusion 352 when the rotating core 32 rotates clockwise.

[0051] The pushing surface 3163 is located on the rotation path of the passive protrusion 352 when it rotates counterclockwise.

[0052] Therefore, when the rotating core 32 rotates in the clockwise direction, the moving direction of the passive protrusion 352 will face the rotation stopping surface 3162, and when the rotating core 32 rotates in the counterclockwise direction, the moving direction of the passive protrusion 352 will face the pushing surface 3163.

[0053] When the active protrusion 351 is exposed from the surface of the hook 3223, the clockwise rotation of the rotating core 32 will cause the passive protrusion 352 to abut against the anti-rotation surface 3162. At this time, the rotating core 32 is stuck by the ratchet 316 and cannot rotate. When the rotating core 32 rotates counterclockwise, the passive protrusion 352 will abut against the pushing surface 3163, and the pushing surface 3163 can push the passive protrusion 352, so that the limiting plate 35 rotates around the rotating protrusion 353. During the rotation of the limiting plate 35, the passive protrusion 352 will gradually leave the ratchet groove 3161 along the surface of the pushing surface 3163, so that the ratchet 316 will not affect the counterclockwise rotation of the rotating core 32. When the pushing surface 3163 is no longer in contact with the passive protrusion 352, the limiting elastic member 36 will pull the limiting plate 35 to reset, so that the passive protrusion 352 continues to be located in the ratchet groove 3161.

[0054] When the active protrusion 351 is pushed into the hook 3223, that is, the active protrusion 351 is completely in the clearance groove 3224. The rotation of the limit plate 35 will make the passive protrusion 352 no longer in the ratchet groove 3161. At this time, the limit plate 35 and the ratchet 316 will not interfere with each other, and the rotating core 32 is in a free rotation state, which can rotate clockwise or counterclockwise. However, under the action of the coil spring 33, the rotating core 32 at this time will have a tendency to keep winding the pull rope 11, that is, the rotating core 32 has a tendency to rotate clockwise. At this time, the winder 3 will keep winding the pull rope 11.

[0055] An isolation sleeve 323 is also provided between the limiting plate 35 and the ratchet 316. The isolation sleeve 323 has a through opening 3231, and one end of the passive protrusion 352 passes through the through opening 3231 and enters the groove of the ratchet 316. The isolation sleeve 323 is mainly used to prevent the entire limiting plate 35 from directly contacting the ratchet 316, and to reduce the wear caused by the relative rotation of the limiting plate 35 and the ratchet 316.

[0056] The isolation sleeve 323 defines a second mounting groove 3232 , and a second mounting protrusion 3233 matching the second mounting groove 3232 is fixed to the side wall of the second chamber 3222 .

[0057] The implementation principle of the embodiment is as follows: at the beginning, the winder 3 has not yet been installed on the pull rope 11, and the coil spring 33 of the winder 3 needs to be charged, and the rotating core 32 is pushed to rotate counterclockwise under the action of external force. After the charge of the coil spring 33 is fully charged, the coil spring 33 will have a tendency to push the rotating core 32 to rotate clockwise, but due to the action of the limit plate 35, the passive protrusion 352 on the limit plate 35 is abutted by the anti-rotation surface 3162 of the ratchet 316, and the rotating core 32 and the ratchet 316 are relatively stationary, and the rotating core 32 will not rotate clockwise at this time.

[0058] Then, wind the lower end of the drawstring 11 around the hook 3223. At this time, the drawstring 11 contacts the active protrusion 351 exposed outside the hook 3223. However, since the drawstring 11 does not have enough force to push the active protrusion 351 into the relief groove 3224 at this time, the winder 3 will not wind the drawstring 11 either.

[0059] Hang the curtain body 1 on the door frame. The drawstring 11 hangs down naturally, and the self-weight of the winder 3 is not enough to make the drawstring 11 pull the limit disk 35 to rotate. At this time, the curtain body 1 has not been retracted yet.

[0060] When it is necessary to retract the curtain body 1 to any position, press the height adjuster 2 with one hand to move the height adjuster 2 at any position of the drawstring 11. Hold the winder 3 with the other hand and slightly pull down the winder 3. During the process of pulling down the winder 3, the drawstring 11 is stressed and tightened, and the drawstring 11 will push the active protrusion 351 to make the active protrusion 351 enter the relief groove 3224. At this time, the limit disk 35 rotates, and the passive protrusion 352 will leave the ratchet tooth groove 3161. Without the limitation of the ratchet 316, the torsion spring 33 can make the core 32 rotate clockwise, so as to wind the drawstring 11. After the drawstring 11 is wound several times, the end of the drawstring 11 will be pressed by the drawstring 11 wound around the core 32, so as to keep the end of the drawstring 11 pressing on the active protrusion 351. Finally, the winder 3 is kept in a state of continuously winding the drawstring 11.

[0061] The winder 3 will continuously wind the remaining drawstring 11. After determining the position of the height adjuster 2, the winder 3 will be stopped by the height adjuster 2. The winder 3 is always abutted below the height adjuster 2.

[0062] The above are all preferred embodiments of the present application, and are not used to limit the protection scope of the present application; therefore, according to the technical solution of the present invention, without changing the essential spirit of the present invention, those of ordinary skill in the art can propose various structural ways and implementation ways that can be mutually replaced. Therefore, the above specific implementation manners and the drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or regarded as a limitation or restriction on the technical solution of the present invention. Therefore: all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A door curtain with freely adjustable height, comprising a curtain body (1) and a drawstring (11), wherein the drawstring (11) is passed through the curtain body (1) in the length direction and one end of the drawstring (11) extends out of the bottom of the curtain body (1), and the other end of the drawstring is fixed to the top of the curtain body, characterized in that: One end of the pull cord (11) extending out of the bottom of the curtain body (1) is connected to a height adjustment member (2); the end of the pull cord (11) is connected to a winder (3); the winder (3) comprises a housing (31) having a rotating shaft (314) and a rotating core (32) sleeved on the rotating shaft (314); a coil spring (33) is built into the rotating core (32); two ends of the coil spring (33) are respectively connected to the rotating shaft (314) and the rotating core (32); the end of the pull cord (11) is connected to the rotating core (32) through an opening (311) of the housing (31) and is wound up by the rotating core (32); the height adjustment member (2) is restricted outside the opening (311) of the winder (3).

2. A door curtain with freely adjustable height as claimed in claim 1, characterized in that: The height adjustment member (2) comprises a first clamping portion (21), a second clamping portion (22) movable relative to the first clamping portion (21), and a clamping elastic member (23) arranged between the first clamping portion (21) and the second clamping portion (22); the pull rope (11) is respectively passed through the first clamping portion (21) and the second clamping portion (22); the first clamping portion (21) and the second clamping portion (22) clamp the pull rope through the tension of the clamping elastic member (23).

3. A door curtain with freely adjustable height as claimed in claim 2, characterized in that: The rotating core (32) comprises a shaft sleeve (322), a hook (3223) fixedly arranged on the shaft sleeve (322), and a one-way rotation limiting assembly (34) rotatably arranged on the shaft sleeve (322); the hook (3223) is connected to the pull rope (11), and the active end of the one-way rotation limiting assembly (34) is located on the hook (3223); the housing (31) is limitedly connected to a ratchet (316); the passive end of the one-way rotation limiting assembly (34) can be located in a ratchet groove (3161) of the ratchet (316) or inside or outside the ratchet groove (3161) of the ratchet (316).

4. A door curtain with freely adjustable height as claimed in claim 3, characterized in that: The ratchet groove (3161) has a rotation-stopping surface (3162) and a pushing surface (3163); the movement of the passive end toward the pushing surface (3163) can be restricted by the rotation-stopping surface (3162); and the movement of the passive end toward the pushing surface (3163) can be pushed by the pushing surface (3163).

5. A door curtain with freely adjustable height as claimed in claim 4, characterized in that: The one-way rotation limit assembly (34) comprises a limit elastic member (36) and a limit plate (35) rotatably connected to the shaft sleeve (322); the limit plate (35) has an active protrusion (351); the active end of the one-way rotation limit assembly (34) is the active protrusion (351); the hook (3223) is provided with a clearance groove (3224); the active protrusion (351) is located in the clearance groove (3224), and one side of the active protrusion (351) extends out of the clearance groove (3224); the two ends of the limit elastic member (36) are respectively connected to the limit plate (35) and the shaft sleeve (322); the limit plate (35) has a passive protrusion (352); the passive protrusion (352) is the passive end of the one-way rotation limit assembly (34); the limit plate (35) also has a rotating protrusion (353) rotating around the shaft sleeve (322).

6. A door curtain with freely adjustable height as claimed in claim 5, characterized in that: The shaft sleeve (322) is provided with a first chamber (3221) and a second chamber (3222); the coil spring (33) is located in the first chamber (3221); and the one-way rotation limiting assembly (34) and the ratchet (316) are both located in the second chamber (3222).

7. A door curtain with freely adjustable height according to any one of claims 2 to 6, characterized in that: The housing (31) comprises an upper shell (312) and a lower shell (313); the rotating core (32) is located between the upper shell (312) and the lower shell (313); a rotating shaft (314) is fixed to the upper shell (312); one end of the rotating shaft (314) passes through the rotating core (32) and is connected to the lower shell (313).

8. A door curtain with freely adjustable height as claimed in claim 7, characterized in that: The rotating core (32) is fixedly provided with a fixing plate (315); one end of the coil spring (33) is connected to the rotating shaft (314), and the other end is connected to the rotating shaft (314).

9. A door curtain with freely adjustable height according to any one of claims 1 to 7, characterized in that: The curtain body (1) is provided with a plurality of pull rings (12) along the length direction, and the pull rope (11) passes through the plurality of pull rings (12) in sequence.

10. A door curtain with freely adjustable height as claimed in claim 9, characterized in that: A fixing strip (13) is sewn in the length direction of the curtain body, and each pull ring (12) is sewn to the fixing strip (13) by means of a thin rope.

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